How to Fix Blurry Background Images on iOS 7 Devices?

Fixed Background Image Compatibility with iOS 7

When it comes to implementing a fixed background image, it's crucial to ensure compatibility across different devices and browsers. However, certain issues can arise specifically on iOS 7.

One user recently encountered a situation where the background image on their website appeared zoomed in and blurry on iPads running iOS 7. The user provided the following CSS code:

.header {
  display: table;
  height: 100%;
  width: 100%;
  position: relative;
  color: #fff;
  background: url(../images/boston2.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

To resolve this issue, there are a couple of potential solutions:

Option 1: Use Background-Attachment

One approach is to use background-attachment: scroll instead of fixed. While this method will not achieve the intended effect of a fixed background, it will allow the images to appear on mobile browsers.

Option 2: Use Background-Position and JavaScript

Alternatively, you can set background-position: scroll and include JavaScript to keep the image at the scrolled position, effectively "faking" a fixed background. Here's a sample implementation:

// Calculate the initial scroll position
var scrollPosition = window.scrollY;

// Add an event listener for the scroll event
window.addEventListener("scroll", function () {
  // Update the scroll position as the user scrolls
  scrollPosition = window.scrollY;

  // Set the background position to be scrolled with the window
  document.querySelector(".header").style.backgroundPosition = "center " + scrollPosition + "px";
});

This JavaScript approach provides a dynamic solution that maintains the fixed background effect on iOS 7 devices while also avoiding the blurry and zoomed-in image issues.

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